Remember in the movie Practical Magic (Don't groan yet...) when they had to do an exorcism to get rid of the bad boyfriend infesting Nicole Kidman, and Sandra Bullock was calling all the nieghbors that once picked on her to come help and told them to "bring their brooms"?
And they all showed up with ordinary, plastic, bought-at-walmart brooms? And their ritual (albiet fictional and exagerated) worked anyway?
They didn't all have to switch to wooden old fashioned brooms for their ritual to work. (Forget even that I'm referring to fictional events, I just needed an example most people can picture if they've seen the movie.)
I've seen some dispute over plastics being faux pas in ritual. I've even subscribed to it as plastic is manmade and doesn't come from previously existing lifeforms (like wood to trees).
But could your ole reliable you got cheap at WalMart be more potent for you to cleanse your sacred space than a 200 dollar hand-made antique-look-alike you bought online or at a craft fair?
You use a plastic broom to sweep your house, manually removing dirt (negativity) from your kitchen or other rooms. It's an actual thing you use often and associate with removing dirt from the home.
Some people may make a specific distinction between the wooden broom they may have bought (or may just desire from a distance) but without knowing the feel of it in your hands as well, the pressure applied to use it and the feeling of satisfaction when the dirt is gone, would you have the same relationship with your wooden broom as the women of old did, when that WAS all that was available to them and they DID clean their kitchens with it? Or, despite materials, would ole reliable be a better choice for attempting to have the same association?
I personally don't feel as if plastic holds energy on its own, and usually scoff at anything like plastic wands and I am even reluctant to use Sculpy, a poly-based faux clay, on it while I do use it for arts and crafts.
But with cleansing negative energy with a broom isn't it more the intent of your mind that counts? Would the plastic even make a difference?